Method for producing cellulose acylate, cellulose acylate film, and polarizer, retardation film, optical film and liquid-crystal display device comprising the film
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United States of America Patent
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Issued Date -
Apr 26, 2007
app pub date -
Oct 19, 2006
filing date -
Oct 21, 2005
priority date (Note) -
Abandoned
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Abstract
A method for producing a cellulose acylate having a predetermined substitution degrees, which comprises acylating cellulose with an esterifying agent that contains an excessive amount of an acid anhydride relative to the hydroxyl group of cellulose, and mixing the reaction mixture with a water-containing reaction stopper to thereby hydrolyze the acid anhydride while controlling the temperature of the reaction mixture to fall between -30.degree. C. and 35.degree. C.
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